Fix: Configure CORS and enable credentialsFix: Configure CORS to allow frontend-backend communication

[vansh1925]

Description

Fixes CORS errors when frontend requests backend API.

Changes

• Added CORS configuration with specific allowed origins (FRONTEND_URL env var)
• Enabled credentials support in both backend and frontend
• Added .env.example files for environment setup documentation
• Set allowed methods and headers for CORS

Testing

• Backend runs on port 5001
• Frontend runs on port 3000
• No CORS errors in browser console
• API requests succeed with proper credentials

Closes #1

[vansh1925]

Thanks for the review and merge! Appreciate it.

[Alen983]

@vansh1925 No worries!.Thank you for your contribution.
if you liked the repo, don't forget to star it.
Thank you.